Hello,
I have dug up this coin.
It has given me the best clue: RAGUSA
Makes complete sense as it was found near Dubrovnik.
My research would suggest that this coin is pre 1600s as coins after this century virtually all Ragusa coins have St Blais on them.
This coin clearly depicts entrance to the city, which the closest reference photo on here I find is a “follaro type 3" ~ 1452-1612. It does state that a type 1 and 2 precedes this pictured coin, however there are no reference pictures….
The weight is very close to Type 1 (.72) and the dimension is indeed 15mm
The reverse of the coin does not offer much more help other than “ragusa” again with a few extra letters.
Could this in fact be the Follaro type 1?

